EP2412082A2 - Moteur électrique - Google Patents

Moteur électrique

Info

Publication number
EP2412082A2
EP2412082A2 EP10710213A EP10710213A EP2412082A2 EP 2412082 A2 EP2412082 A2 EP 2412082A2 EP 10710213 A EP10710213 A EP 10710213A EP 10710213 A EP10710213 A EP 10710213A EP 2412082 A2 EP2412082 A2 EP 2412082A2
Authority
EP
European Patent Office
Prior art keywords
electric motor
rotor
braking
stator
brake
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP10710213A
Other languages
German (de)
English (en)
Other versions
EP2412082B1 (fr
Inventor
Matthias Hiller
Andreas Spielmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Metabowerke GmbH and Co
Original Assignee
Metabowerke GmbH and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Metabowerke GmbH and Co filed Critical Metabowerke GmbH and Co
Publication of EP2412082A2 publication Critical patent/EP2412082A2/fr
Application granted granted Critical
Publication of EP2412082B1 publication Critical patent/EP2412082B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/12—Structural association with clutches, brakes, gears, pulleys or mechanical starters with auxiliary limited movement of stators, rotors or core parts, e.g. rotors axially movable for the purpose of clutching or braking
    • H02K7/125—Structural association with clutches, brakes, gears, pulleys or mechanical starters with auxiliary limited movement of stators, rotors or core parts, e.g. rotors axially movable for the purpose of clutching or braking magnetically influenced
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/18—Electric or magnetic
    • F16D2121/20—Electric or magnetic using electromagnets
    • F16D2121/22—Electric or magnetic using electromagnets for releasing a normally applied brake
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/102—Structural association with clutches, brakes, gears, pulleys or mechanical starters with friction brakes
    • H02K7/1021—Magnetically influenced friction brakes
    • H02K7/1026—Magnetically influenced friction brakes using stray fields

Definitions

  • the invention relates to an electric motor with an electric motor brake, in particular for angle grinder, with a stator having at least one pair of poles, with at least two in each case one inwardly directed towards a rotor pole piece poles, each pole piece is surrounded by a winding, and wherein the stator receives at least one braking device for braking the rotor, which comprises a braking element.
  • the braking element for braking against the outer circumference of the rotor is movable and movable by the magnetic field in the energized state of the electric motor against a braking force, so that the braking device is dissolved in the energized state of the electric motor.
  • GB 920, 485 describes an electric motor having a housing and poles fixed in the housing and a rotor and a magnetic brake element disposed within the poles, the braking element causing the rotor to decelerate when engaged with a rotor Brake force can be acted upon or is not lifted by one of the braking force counteracting force from the rotor.
  • the document describes a purely radially acting braking device, so that the maximum achievable braking effect is comparatively low.
  • Another electric motor with brake is also known from DE 847 933, wherein the brake consists of a trained as a rocker arm of the stator.
  • EP 1 149 458 B1 describes an electric motor with an electromagnetic brake, in particular for an angle grinder, of the generic type, in which case the braking device is accommodated in a pole and the braking element is designed as a rocker which is movably mounted within a free space of the pole about a pivot axis wherein the brake element is a multi-arm lever with a brake arm and a release arm and the brake arm can be acted upon by a braking force and the release arm exerts a disengaged force opposing the braking force on the brake element when the winding is energized.
  • a similar motor with braking device within a pole shoe shows WO 2004/088821.
  • the invention solves this problem by an electric motor with the features of claim 1, wherein the braking device is arranged in the stator in the circumferential direction between two poles and the braking element is designed as a one-armed brake lever, which at one end about a pivot point in the stator is pivotable, so that is dispensed with a bearing of the brake lever by a shaft or axle.
  • the mounting of the brake element is therefore not via a rotational axis, but the brake element is pivotally mounted about a pivot point in the housing of the stator.
  • the leadership does not take place via a rotation axis, but advantageously via a slotted guide, wherein the gate is formed by the stator housing.
  • the pivot point is provided at one end of the brake lever, wherein the brake lever is guided with this end in the gate in the stator and can be pivoted so.
  • the arrangement of the brake lever in the circumferential direction between the poles and the pole shoes opens up further degrees of freedom in the design, since there is better access to the outer circumference of the rotor.
  • the braking element consists of a magnetically conductive material, so as to achieve opening of the brake when powering the field by the magnetic force of the braking force, which presses the brake member against the rotor, and thus lifts the brake member from the rotor , It can further be provided that the brake element has a brake pad on its side facing the rotor.
  • the brake pad may be formed of a non-conductive material, thereby preventing the brake pad from being energized when the field is energized in the direction of the rotor.
  • the brake pad in the radial direction has a thickness such that it bridges the gap between the stator and the rotor. Even in the off-hook condition of the rotor, there is preferably only a small gap between the brake pad and the rotor. The gap can correspond to the gap between the pole piece and the rotor in the lifted state. So only the brake element has to make a small way when disengaging from the braking position.
  • the braking force is applied by a spring.
  • the spring can essentially run in the radial direction, as provided for example in the prior art according to EP 1 149 458 B1.
  • an axially extending spring is provided which acts on the brake element with a braking force in the direction of the rotor, wherein the spring may be formed as a bar spring.
  • Such a provision of a bar spring offers the advantage over the provision of a radial spring, as described in the prior art, that the provision of several spring elements can be dispensed with.
  • other springs or spring elements may be provided, for. B. radially acting springs.
  • axial direction should always be understood the axial direction of a motor shaft.
  • more than one braking device is provided.
  • braking devices can be provided on two opposite sides between the poles. The braking devices are then formed rotationally symmetric in the rule.
  • more than two poles are provided, in which case one or more brake devices can be arranged between the poles.
  • the braking devices which are arranged between the poles, in no case by the excitation windings, which enclose the pole piece, enclosed.
  • the surface of the brake element, on which the brake pad is applied, and which faces in the direction of the rotor, the contour of the stator, which surrounds the brake element continues.
  • D. h. The gap between stator and rotor bridged in this case, only the brake pad.
  • the brake lining must have sufficient thickness in the radial direction for this purpose.
  • short-circuit windings are provided on the brake lever, wherein at least one short-circuit winding is provided.
  • the short-circuit winding serves to prevent fluttering of the lever and thus the brake in AC operation.
  • the braking device can in this case with respect to the direction of rotation of the rotor z. B. can be arranged alsaufend. In this case, it has a self-reinforcing effect. In reverse arrangement to the direction of rotation, the braking force is determined only by the spring force. However, in this case, the opening and closing of the braking device is easier to control.
  • the brake element may extend over the entire length of the stator or only over a part thereof. In particular, it can be provided that it extends over approximately the entire axial length and is provided only at the two ends of the stator in the axial direction for stability reasons, no brake element.
  • the invention further relates to a
  • Electric hand tool in particular an angle grinder, with an electric motor of the type described above.
  • Figure 2 is a plan view in the axial direction of an electric motor
  • Figure 3 is a perspective view of the corresponding electric motor.
  • an electric motor is designated by the reference numeral 10, wherein the electric motor 10, only the left half in the illustration is shown.
  • the right half of the electric motor 10 may be rotationally symmetrical.
  • the electric motor in this case comprises a stator 12 and a rotor 14.
  • the stator 12 comprises a pair of poles, of which a first pole is designated by the reference numeral 16 and a second pole by the reference numeral 18.
  • the poles 16, 18 are diametrically opposite each other.
  • the poles 16, 18 comprise pole shoes 17, 19, which are directed by a yoke 20 inwardly in the direction of the rotor and two in each case Pole horns 22, wherein each pole piece 17, 19 only one pole piece 22 is shown.
  • Windings 24 are provided between the pole horns 22 and the yoke 20 and are located in an intermediate space formed by the distance between the pole piece 22 and the yoke 20 and do not protrude beyond the ends of the pole horns in the circumferential direction.
  • the rotor preferably rotates clockwise. However, it can also be provided a reverse direction of rotation.
  • the winding 24 thus surrounds the respective pole piece 17, 19.
  • a braking device 26 which comprises a brake member 28 which is formed as a one-armed brake lever 29.
  • the brake lever 29 is rotatably mounted about a pivot point 30 in the stator 12.
  • the pivot point 30 is provided at one end of the one-armed brake lever 29, wherein the guide of the brake lever 29 is realized in the stator 12 via a slotted guide. In this way, a storage of the brake lever 29 via a shaft is no longer necessary.
  • the brake lever 29 carries a brake pad 32 which is lifted in the illustrated state of the rotor 14 so that between the brake pad 32 and the rotor 14, a small gap, wherein the gap between the brake pad 32 and the rotor 14, the gap in terms of dimensions between the rotor 14 and the pole pieces 17, 19 corresponds.
  • the brake pad 32 is disposed on the side 38 of the brake lever 29, which faces the rotor 14.
  • the brake pad 32 is arranged so that it is able to apply a radial braking force to the rotor 14. It is located substantially centrally on the brake lever 29 and does not extend over the entire length of the lever arm of the brake lever 29th
  • the material of the brake pad 32 is formed from a substantially non-magnetically conductive material, whereas the material of the brake lever 29 is formed of a magnetically conductive material.
  • the brake lever 29 forms two contact surfaces 34 and 36 with the stator 12. If a pivoting of the brake lever 29 about the pivot point 30, the contact surfaces 34 and 36 are lifted from the associated surfaces of the stator 12, so that there is a slight gap here. As a result, the brake pad 32 is brought against the rotor 14 for conditioning.
  • the brake lever 29 has a surface 38 which is directed towards the rotor 14, wherein the surface 38 substantially follows the contour of the stator 12.
  • a spring 40 is provided, which extends in the axial direction, so that the spring 40 abuts against the brake lever 29 over its axial length and this applied over the entire or approximately the entire length with a radial force to the inside, so that the brake lever 29 is pressed against the outer periphery of the rotor 14.
  • the attachment of the spring 40 is shown in Figures 2 and 3. It is a rod or leg spring.
  • the brake lever 29 performs a limited pivoting about the pivot point 30, which is sufficient, however, to lift the brake pad 32 from the rotor 14.
  • the surfaces of the brake lever endeavor to close the gap between itself and the surfaces of the stator.
  • a short-circuit winding 42 is provided which is intended to prevent that there is a vibration of the braking device 26 when energized winding 24, which would cause the brake pad 32 briefly repeatedly come into contact with the rotor 14 and a chattering of the Brake and noise would result.
  • the braking device 26 is automatically triggered when the engine 10 is switched off.
  • FIG. 2 now shows a half plan view of a corresponding electric motor, as is shown perspectively in FIG. 3.
  • the drive shaft of the electric motor is designated here by the reference numeral 44.
  • the same components are denoted by the same reference numerals, and here the attachment of the spring 40 can be seen, which is fixed to a component 46, so that it exerts a substantially radial force on the brake member 28.
  • the arrangement of the spring 40 can be seen in particular also in Figure 3.
  • the determination of the spring takes place in a so-called coil support head 50, in which case unused contacting elements 52 are used for spring mounting and receiving.
  • an electric motor 10 can be provided, in which a simple storage of a braking device 26 outside of the poles 16, 18 is made possible, with a storage about a pivot axis can be dispensed with.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Braking Arrangements (AREA)

Abstract

L'invention concerne un moteur électrique (10) avec un frein-moteur, en particulier pour une ponceuse d'angle, avec un stator (12) comprenant au moins une paire de pôles (16, 18), avec au moins deux pôles (16, 18) possédant chacun un épanouissement polaire (17, 19) orienté vers l'intérieur en direction d'un rotor (14) et entourés d'un bobinage (24). Le stator (12) reçoit au moins un dispositif de freinage (26) afin de freiner le rotor (14), comprenant un élément de frein (28). L'élément de frein (28) peut être déplacé contre la circonférence extérieure du rotor (14) pour le freinage et, lorsque le moteur électrique (10) est parcouru par le courant, peut être déplacé par le champ magnétique à l'encontre de la force de freinage. Selon l'invention, il est prévu que le dispositif de freinage (26) soit disposé dans le stator (12) dans la direction de la circonférence entre les deux pôles (16, 18) et que l'élément de frein (28) prenne la forme d'un levier de frein (29) à bras unique qui peut basculer à l'une de ses extrémités autour d'un point de rotation (30) dans le stator (12), si bien que l'on peut renoncer à supporter le levier de frein (29) par un arbre ou un axe.
EP10710213.9A 2009-03-25 2010-03-17 Moteur électrique Active EP2412082B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009014783A DE102009014783A1 (de) 2009-03-25 2009-03-25 Elektromotor
PCT/EP2010/001655 WO2010108621A2 (fr) 2009-03-25 2010-03-17 Moteur électrique

Publications (2)

Publication Number Publication Date
EP2412082A2 true EP2412082A2 (fr) 2012-02-01
EP2412082B1 EP2412082B1 (fr) 2014-01-22

Family

ID=42646347

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10710213.9A Active EP2412082B1 (fr) 2009-03-25 2010-03-17 Moteur électrique

Country Status (4)

Country Link
US (1) US8618704B2 (fr)
EP (1) EP2412082B1 (fr)
DE (1) DE102009014783A1 (fr)
WO (1) WO2010108621A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017212125A1 (de) 2017-07-14 2019-01-17 Krones Ag Förderspeichervorrichtung
CN111082597A (zh) 2018-10-19 2020-04-28 奥的斯电梯公司 电机和电梯系统

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE538902C (de) 1927-03-31 1931-11-20 Lorenz Akt Ges C Schaltungsanordnung zur Frequenzvervielfachung mittels statischer Frequenztransformatoren unter Verwendung eines Stromresonanzkreises als Vervielfachungskreis
DE847933C (de) 1951-02-10 1952-08-28 Avog Elektro Und Feinmechanik Magnetisch betaetigte Bremse fuer Kleinmotoren, insbesondere fuer elektrische Scheibenwischer
US2959695A (en) * 1958-12-31 1960-11-08 Lear Inc Magnetic motor pole piece radial brake
DE1538902A1 (de) * 1966-09-21 1970-02-26 Licentia Gmbh Spaltpolmotor mit elektromagnetisch betaetigter Bremsvorrichtung
DE19737239A1 (de) * 1997-08-27 1999-03-11 Bosch Gmbh Robert Elektromotor
DE19833445B4 (de) * 1998-07-24 2006-03-02 Knorr-Bremse Systeme für Schienenfahrzeuge GmbH Scheibenbremse für Schienenfahrzeuge
DE19860396A1 (de) * 1998-12-28 2000-06-29 Bosch Gmbh Robert Elektromotor mit elektromagnetischer Bremse
DE10314887B4 (de) * 2003-04-01 2016-09-15 Robert Bosch Gmbh Bremseinrichtung für einen Elektromotor
DE10314886A1 (de) * 2003-04-01 2004-11-11 Robert Bosch Gmbh Bremseinrichtung für einen Elektromotor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010108621A2 *

Also Published As

Publication number Publication date
US20120013203A1 (en) 2012-01-19
WO2010108621A3 (fr) 2011-11-24
EP2412082B1 (fr) 2014-01-22
US8618704B2 (en) 2013-12-31
DE102009014783A1 (de) 2010-10-07
WO2010108621A2 (fr) 2010-09-30

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